Hydros stuff is pretty great, and there are a lot of us here than can help you. I’m not a power user by any means but I’ve got a pretty extensive collective that covers a lot (control, xp8, WiFi, ATO, soles, wave engine, minnow).
Re dosing - the minnow is great for scheduled, small doses. I am using it for Alk/Ca duty. Has been great for this. Stays calibrated, very quiet, easy to setup.
The Sole is better for continuous duty and/or precision dosing over time like Kalkwasser, auto water change, lanthanum. It’s overkill for element dosing, and is pretty large and robust. Not as easy to setup (see my tank journal) but is also dead accurate and stays calibrated. I have two on AWC duty.